This colorful artistic feature atop a Danish art gallery allows visitors to stroll through a rainbow.

Experience architect Le Corbusier's modernist design for living in the home he designed for himself.

A swing to dangle you off the very edge.

This giant boulder is pinched over a 1000-meter abyss by two mountains.

The tallest outdoor elevator in Europe rockets passengers on a dizzyingly precarious ride to the top of a mountain.

A set of ancient drawings in the desert of Peru that are so massive, many of them can only be fully seen from the sky.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

This real life asylum of horrors is now an abandoned ruin that hides the unbreakable code to one patient's insanity.

The largest Neolithic ruins in the world hide a notably clean prehistoric metropolis.

While not Turkey's deepest underground city, this subterranean redoubt is the largest.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

Hidden in an Italian forest is a completely homemade amusement park that has taken a lifetime to create.

Filled with goldfish swimming in a shallow pool of sea water, this ancient crypt is more wishing well than burial site.

This Russian museum stresses the importance of keeping clean and even holds one of Pavlov's dogs.

This abandoned Belgian fortress is purposefully being left to nature.

Long-secret natural history museum, featuring the skull of a "Terror Bird."

A treasure trove of pathological, forensic, parasitological, and anatomical specimens.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

This subterranean necropolis holds three floors of antler-dug grave caves.

The centuries-old trees lining both sides of this dirt road may become Madagascar's first natural monument.

A small, but award-winning beach known for its literally spotless reputation.

The only pollutant in the clear blue water is sunscreen.

The largest collection of Indigenous Australian artifacts in the world, and the rare museum where wood-and-glass cabinets have trumped interactive exhibits.

Stunning wetlands ablaze with pink lotus flowers.